Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Securities Available-for-Sale, Due in one year or less, Cost	$ 8,024
Securities Available-for-Sale, Due after one year through five years, Cost	20,221
Securities Available-for-Sale, Due after five years through ten years, Cost	29,702
Securities Available-for-Sale, Due after ten years, Cost	289,065
Securities Available-for-Sale, Cost, Total	347,012
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	7,973
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	20,729
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	30,306
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	284,419
Securities Available-for-Sale, Estimated Fair Value, Total	343,427
Securities Held-to-Maturity, Due after ten years, Cost	14,344
Securities Held-to-Maturity, Cost, Total	14,344	4,117
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	15,015
Securities held-to-maturity, Estimated Fair Value	$ 15,015	$ 5,335